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From: Hannes Reinecke <hare@suse.de>
To: Jens Axboe <axboe@kernel.dk>
Cc: linux-scsi@vger.kernel.org,
	"Martin K. Petersen" <martin.petersen@oracle.com>,
	James Bottomley <james.bottomley@hansenpartnership.com>,
	Christoph Hellwig <hch@lst.de>,
	linux-block@vger.kernel.org,
	Hans Holmberg <hans.holmberg@wdc.com>,
	Damien Le Moal <damien.lemoal@wdc.com>,
	Hannes Reinecke <hare@suse.de>
Subject: [RFC PATCH 0/2]  blk-mq I/O scheduling fixes
Date: Thu, 19 Sep 2019 11:45:45 +0200	[thread overview]
Message-ID: <20190919094547.67194-1-hare@suse.de> (raw)

Hi all,

Damien pointed out that there are some areas in the blk-mq I/O
scheduling algorithm which have a distinct legacy feel to it,
and prohibit multiqueue I/O schedulers from working properly.
These two patches should clear up this situation, but as it's
not quite clear what the original intention of the code was
I'll be posting them as an RFC.

So as usual, comments and reviews are welcome.

Hannes Reinecke (2):
  blk-mq: fixup request re-insert in blk_mq_try_issue_list_directly()
  blk-mq: always call into the scheduler in blk_mq_make_request()

 block/blk-mq.c | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

-- 
2.16.4


             reply	other threads:[~2019-09-19  9:45 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-19  9:45 Hannes Reinecke [this message]
2019-09-19  9:45 ` [PATCH 1/2] blk-mq: fixup request re-insert in blk_mq_try_issue_list_directly() Hannes Reinecke
2019-09-19 14:19   ` Ming Lei
2019-09-20  6:42     ` Hannes Reinecke
2019-09-19 14:52   ` Guoqing Jiang
2019-09-19  9:45 ` [PATCH 2/2] blk-mq: always call into the scheduler in blk_mq_make_request() Hannes Reinecke
2019-09-19 10:21   ` Damien Le Moal
2019-09-19 14:23     ` Ming Lei
2019-09-19 15:48       ` Kashyap Desai
2019-09-19 16:13         ` Damien Le Moal
2019-09-21 15:26   ` [blk] b91f4a426e: fio.write_bw_MBps -9.3% regression kernel test robot
2019-09-21 15:26     ` kernel test robot
2019-09-19  9:56 ` [RFC PATCH 0/2] blk-mq I/O scheduling fixes Liu, Sunny
2019-09-19 10:03   ` Damien Le Moal
     [not found]     ` <BJXPR01MB0296594F3E478B5BFD4DA2ABF4890@BJXPR01MB0296.CHNPR01.prod.partner.outlook.cn>
2019-09-19 12:44       ` Damien Le Moal
2019-09-19 12:54         ` Liu, Sunny
2019-09-19 12:57 ` Hans Holmberg
2019-09-19 17:48 ` Jens Axboe
2019-09-19 21:11   ` Damien Le Moal

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